<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        section{
            width: 750px;
            height: 200px;
            border: 1px solid red;
            display: flex;
            overflow: auto;
            flex-shrink: 0;
        }
        div{
            width: 100px;
            height: 100px;
            background-color: rgb(124, 223, 85);
            flex-shrink: 0;
        }
        div:nth-of-type(4){
            background-color: rgb(196, 209, 75);
            /* flex:1; */
            flex-shrink: 1;
        }
    </style>
</head>
<body>
    <section>
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
        <div>7</div>
        <div>8</div>
    </section>
</body>
</html>